it does get hairy sometimes moreso on or near the bubble.. its common to have like 15 tables going at once when your in about 4-6 players left. thats when its at peak hour.. if im down to heads up in 7, the decisions are even easier.. as its a turbo, the blinds are generally over 200/400, so its just working out a range your going to shove from the button and what your going to call/reshove with in the bb..
but i hear what your saying.. i would play continuously but i like having breaks between sets, so i can, write notes.. ill go into the replayer and input notes on players that way.. and also if i feel i need to review the session if i faced a few spots i was usure of, ill log onto SNG wiz.. but generally im fine with 15 sets.. i dont get timed out all that often. would be nice to have 30 seconds though pokerstars
and its not really affecting my roi, im still running at 12% which is pretty good.
more than 15 then i think your right, its better to space them out... a sng grinder friend of mine said he does this. he will load up say 15 sng, play them for a bit,, then load another 15, and purposly sit out of all the 15 tables for the first two levels.. 10/20 and 15/30,, since they really are pretty unimportant. then he resumes teh games once the blinds hit 25/50.